There is a comprehensive account of some aspects of pollinator conservation in the recent issues of BEE WORLD (Volume 72: 1991), mostly about Europe. Corbet et al. Bee World 72(2):47-59 Osborne et al. Bee World 72(3):99-116 Especially relevant to the NW USA is the paper by Robinson and Johansen (1978) in Melanderia 30:9-57 "Effect of control chemicals for Douglas-fir tussock moth, Orgyia pseudotsugata (McDunnough) on forest pollination (Lepidoptera:Lymantriidae)" Data on the demise of pollinator populations is given in several papers from various parts of the world, most having to do with bees. I will be happy to provide anyone interested with a bibliography (albeit incomplete) by regular mail.